On Tue, Mar 19, 2013 at 06:14:45PM +0100, Paolo Bonzini wrote: > Il 19/03/2013 18:09, Michael R. Hines ha scritto: > > Allowing QEMU to swap due to a cgroup limit during migration is a viable > > overcommit option? > > > > I'm trying to keep an open mind, but that would kill the migration > > time.....
Maybe not if you have a fast SSD, or are using swap in RAM or compressed swap or ... > Would it swap? Doesn't the kernel back all zero pages with a single > copy-on-write page? If that still accounts towards cgroup limits, it > would be a bug. > > Old kernels do not have a shared zero hugepage, and that includes some > distro kernels. Perhaps that's the problem. > > Paolo AFAIK for zero pages, yes. I'm not sure what the problem is either. -- MST
